FEATURES
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LT1330
5V RS232 Transceiver with
3V Logic Interface and One
Receiver Active in Shutdown
DESCRIPTION
The LT
®
1330 is a three driver, five receiver RS232 trans-
ceiver with low supply current. Designed to interface
with new 3V logic, the LT1330 operates with both a 5V
power supply and a 3V logic power supply. The chip may
be shut down to micropower operation with one receiver
remaining active to monitor RS232 inputs such as ring
detect from a modem.
The LT1330 is fully compliant with all EIA RS232 spec-
ifications. Additionally, the RS232 line input and output pins
are resilient to multiple ±10kV ESD strikes. This eliminates
the need for costly TransZorbs
®
on line pins for the RS232
part.
The LT1330 operates to 120kbaud even driving high
capacitive loads. During shutdown, driver and receiver
outputs are at a high impedance state allowing devices to
be paralleled.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
TransZorb is a registered trademark of General Instrments, GSI.
3V Logic Interface
ESD Protection over
±10kV
Uses Small Capacitors: 0.1μF 0.2μF 1.0μF
,
,
One Low Power Receiver Remains Active While in
Shutdown
Pin Compatible with LT1137A and LT1237
120kBaud Operation for R
L
= 3k, C
L
= 2500pF
250kBaud Operation for R
L
= 3k, C
L
= 1000pF
CMOS Comparable Low Power: 30mW
Easy PC Layout—Flowthrough Architecture
Rugged Bipolar Design
Outputs Assume a High Impedance State When Off
or Powered Down
Absolutely No Latchup
60μA Supply Current in Shutdown
Available in SO and SSOP Packages
APPLICATIONS
n
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Notebook Computers
Palmtop Computers
TYPICAL APPLICATION
Output Waveforms
V
+
1.0μF
2
0.1μF
DRIVER 1 OUT
RX1 IN
DRIVER 2 OUT
TO
LINE
RX2 IN
RX3 IN
RX4 IN
DRIVER 3 OUT
RX5 IN (LOW-Q)
ON/OFF
3V V
L
5V V
CC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LT1330
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT (LOW-Q)
GND
DRIVER
DISABLE
INPUT
RING DETECT IN
μCONTROLLER OR
μPROCESSOR
SHUTDOWN
CONTROL OUT
1330 TA01
1330 TA02
V
–
0.1μF
2
0.1μF
RECEIVER
OUTPUT
V
L
= 3V
C
L
= 50pF
DRIVER
OUTPUT
R
L
= 3k
C
L
= 2500pF
TO LOGIC
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LT1330
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
V
+
5V V
CC
C1
+
C1
–
DR1 OUT
RX1 IN
DR2 OUT
RX2 IN
RX3 IN
1
2
3
4
5
6
7
8
9
28 V
–
27 C2
–
26 C2
+
25 DR1 IN
24 RX1 OUT
23 DR2 IN
22 RX2 OUT
21 RX3 OUT
20 RX4 OUT
19 DR3 IN
RX5 OUT
18 (LOW-Q)
17 GND
16 DRIVER
DISABLE
15 NC
NW PACKAGE
28-LEAD (WIDE) PDIP
Supply Voltage (V
CC
) ..................................................6V
Supply Voltage (V
L
) ....................................................6V
V
+
..........................................................................13.2V
V
–
........................................................................–13.2V
Input Voltage
Driver ............................................................ V
–
to V
+
Receiver .................................................– 30V to 30V
Output Voltage
Driver ......................................................– 30V to 30V
Receiver .......................................– 0.3V to V
L
+ 0.3V
Short-Circuit Duration
V
+
.....................................................................30 sec
V
–
.....................................................................30 sec
Driver Output .............................................. Indefinite
Receiver Output .......................................... Indefinite
Operating Temperature Range
LT1330C................................................... 0°C to 70°C
Storage Temperature Range...................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
RX4 IN 10
DR3 OUT 11
RX5 IN 12
(LOW-Q)
ON/OFF 13
3V V
L
14
G PACKAGE
28-LEAD PLASTIC SSOP
SW PACKAGE
28-LEAD (WIDE) PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 96°C/W (G)
T
JMAX
= 150°C,
θ
JA
= 56°C/W (NW)
T
JMAX
= 150°C,
θ
JA
= 85°C/W (SW)
Consult factory for Military grade parts.
ORDER INFORMATION
LEAD FREE FINISH
LT1330CG#PBF
LT1330CNW#PBF
LT1330CSW#PBF
TAPE AND REEL
LT1330CG#TRPBF
LT1330CNW#TRPBF
LT1330CSW#PBF
PART MARKING
LT1330CG
LT1330CNW
LT1330CSW
PACKAGE DESCRIPTION
28-Lead Plastic SSOP
28-Lead (Wide) PDIP
28-Lead (Wide) Plastic SO
TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
0°C to 70°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
PARAMETER
Power Supply Generator
V
+
Output
V
–
Output
Supply Current (V
CC
)
Supply Current (V
L
)
T
A
= 25°C (Note 3)
(Note 4)
CONDITIONS
The
l
denotes the specifications which apply over the full operating
temperature range (0°C ≤ T
A
≤ 70°C for commercial grade). (Note 2)
MIN
TYP
7.9
–7
l
MAX
UNITS
V
V
6
6
0.1
12
14
1
mA
mA
mA
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LT1330
ELECTRICAL CHARACTERISTICS
PARAMETER
Supply Current When OFF (V
CC
)
Supply Rise Time
Shutdown to Turn-On
ON/OFF Pin Thresholds
ON/OFF Pin Current
DRIVER DISABLE Pin Thresholds
DRIVER DISABLE Pin Current
Oscillator Frequency
Any Driver
Output Voltage Swing
Logic Input Voltage Level
Logic Input Current
Output Short-Circuit Current
Output Leakage Current
Data Rate (Note 8)
Slew Rate
Propagation Delay
Any Receiver
Input Voltage Thresholds
Hysteresis
Input Resistance
Output Leakage Current
Receivers 1, 2, 3, 4
Output Voltage
Output Short-Circuit Current
Propagation Delay
Receiver 5 (LOW Q-Current RX)
Output Voltage
Output Short-Circuit Current
Propagation Delay
Output Low, I
OUT
= – 500μA
Output High, I
OUT
= 160μA (V
L
= 3V)
Sinking Current, V
OUT
= V
CC
Sourcing Current, V
OUT
= 0V
Output Transition t
HL
High to Low (Note 7)
Output Transition t
LH
Low to High
l
l
The
l
denotes the specifications which apply over the full operating
temperature range (0°C ≤ T
A
≤ 70°C for commercial grade). (Note 2)
CONDITIONS
Shutdown (Note 5)
Driver Disable
C1 = C2 = 0.2μF
,
C
+
= 1.0μF C
–
= 0.1μF
,
Input Low Level (Device Shutdown)
Input High Level (Device Enabled)
0V ≤ V
ON/OFF
≤ 5V
Input Low Level (Drivers Enabled)
Input High Level (Drivers Disabled)
0V ≤ V
DRIVER DISABLE
≤ 5V
Driver Outputs Loaded R
L
= 3k
Load = 3k to GND
Input Low Level (V
OUT
= High)
Input High Level (V
OUT
= Low)
0.8V ≤ V
IN
≤ 2V
V
OUT
= 0V
Shutdown V
OUT
= ±30V (Note 5)
R
L
= 3k, C
L
= 2500pF
R
L
= 3k, C
L
= 1000pF
R
L
= 3k, C
L
= 51pF
R
L
= 3k, C
L
= 2500pF
Output Transition t
HL
High to Low (Note 6)
Output Transition t
LH
Low to High
Input Low Threshold (V
OUT
= High)
Input High Threshold (V
OUT
= Low)
l
l
l
l
l
l
l
l
l
MIN
TYP
0.06
3.00
0.2
MAX
0.15
UNITS
mA
mA
ms
V
V
μA
V
V
μA
kHz
V
V
V
V
μA
mA
μA
kBAUD
kBAUD
0.8
–15
0.8
–10
1.4
1.4
1.4
1.4
130
2.4
80
2.4
500
Positive
Negative
l
l
l
l
l
5
7.5
–6.3
1.4
1.4
5
17
10
–5
0.8
20
100
2
±9
120
250
4
15
15
0.6
0.5
30
1.3
1.3
V/μs
V/μs
μs
μs
V
V
V
kΩ
μA
V
V
mA
mA
0.8
0.1
3
l
l
l
1.3
1.7
0.4
5
1
0.2
2.9
–20
20
250
350
0.2
2.9
–4
4
1
1
2.4
1
7
10
0.4
V
IN
= ±10V
Shutdown (Note 5) 0 ≤ V
OUT
≤ V
CC
Output Low, I
OUT
= – 1.6mA
Output High, I
OUT
= 160μA (V
L
= 3V)
Sinking Current, V
OUT
= V
CC
Sourcing Current, V
OUT
= 0V
Output Transition t
HL
High to Low (Note 7)
Output Transition t
LH
Low to High
2.7
–10
10
600
600
0.4
ns
ns
V
V
mA
mA
2.7
–2
2
3
3
μs
μs
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LT1330
ELECTRICAL CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating
temperature range (0°C ≤ T
A
≤ 70°C for commercial grade).
Supply current measurements using driver disable are performed with
V
DRIVER DISABLE
≥ 3V.
Note 6:
For driver delay measurements, R
L
= 3k and C
L
= 51pF. Trigger
points are set between the driver’s input logic threshold and the output
transition to the zero crossing (t
HL
= 1.4V to 0V and t
LH
= 1.4V to 0V).
Note 7:
For receiver delay measurements, C
L
= 51pF. Trigger points are
set between the receiver’s input logic threshold and the output transition to
standard TTL/CMOS logic threshold (t
HL
= 1.3V to 2.4V and t
LH
= 1.7V to 0.8V).
Note 8:
Data rate operation guaranteed by slew rate, short-circuit current
and propagation delay tests.
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Testing done at V
CC
= 5V and V
ON/OFF
= 3V.
Note 3:
Supply current is measured as the average over several charge
pump burst cycles. C
+
= 1.0μF, C
–
= 0.1μF, C1 = C2 = 0.2μF. All outputs are
open, with all driver inputs tied high.
Note 4:
V
L
supply current is measured with all receiver outputs low.
Note 5:
Measurements in shutdown are performed with V
ON/OFF
≤ 0.1V.
TYPICAL PERFORMANCE CHARACTERISTICS
Driver Output Voltage
10
8
DRIVER OUTPUT VOLTAGE (V)
6
4
2
0
–2
–4
–6
–8
–10
–55
–25
50
25
0
75
TEMPERATURE (°C)
OUTPUT LOW
V
CC
= 4.5V
V
CC
= 5V
R
L
= 3k
OUTPUT HIGH
V
CC
= 5V
THRESHOLD VOLTAGE (V)
V
CC
= 4.5V
3.00
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
125
0.50
–55 –25
50
25
0
75
TEMPERATURE (°C)
100
125
INPUT LOW
INPUT HIGH
SUPPLY CURRENT (mA)
Receiver Input Thresholds
80
70
60
50
40
30
20
10
0
Supply Current vs Data Rate
3 DRIVERS ACTIVE
R
L
= 3k
C
L
= 2500pF
100
0
25
50
75
100
DATA RATE (kBAUD)
125
150
1330 G01
1330 G02
1330 G03
V
CC
Supply Current in Shutdown
150
125
100
75
50
25
0
–55 –25
SUPPLY CURRENT (mA)
SUPPLY CURRENT (μA)
5
V
CC
Supply Current in
Driver Disable
3.0
2.5
THRESHOLD VOLTAGE (V)
50
25
0
75
TEMPERATURE (°C)
100
125
2.0
1.5
1.0
0.5
DRIVER DISABLE Threshold
4
3
2
1
50
25
75
0
TEMPERATURE (°C)
100
125
0
–55 –25
0
–55 –25
50
25
75
0
TEMPERATURE (°C)
100
125
1330 G04
1330 G05
1330 G06
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LT1330
TYPICAL PERFORMANCE CHARACTERISTICS
ON/OFF Thresholds
3.0
2.5
THRESHOLD VOLTAGE (V)
SUPPLY CURRENT (mA)
2.0
ON THRESHOLD
1.5
1.0
OFF THRESHOLD
0.5
0
–55 –25
40
35
30
25
20
15
10
5
50
25
75
0
TEMPERATURE (°C)
100
125
0
–55 –25
50
25
0
75
TEMPERATURE (°C)
100
125
0.1
–55 –25
50
25
0
75
TEMPERATURE (°C)
100
125
NO LOAD
1 DRIVER LOADED
R
L
= 3k
3 DRIVERS LOADED
R
L
= 3k
LEAKAGE CURRENT (μA)
10
V
CC
Supply Current
100
Driver Leakage in Shutdown
1
V
OUT
= 30V
V
OUT
= –30V
1330 G07
1330 G08
1330 G09
Driver Short-Circuit Current
30
SHORT-CIRCUIT CURRENT (mA)
25
20
15
I
SC
10
5
0
–55 –25
–
Receiver Short-Circuit Current
40
SHORT-CIRCUIT CURRENT (mA)
35
30
25
20
15
10
5
RX5 I
SC–
RX5 I
SC+
RX1 TO RX4
I
SC–
RX1 TO RX4
I
SC+
I
SC+
50
25
75
0
TEMPERATURE (°C)
100
125
0
–55 –25
50
25
0
75
TEMPERATURE (°C)
100
125
1330 G10
1330 G11
Receiver Output Waveforms
RX5 OUTPUT
C
L
= 50pF
DRIVER OUTPUT
R
L
= 3k
C
L
= 2500pF
Driver Output Waveforms
RX1 TO RX4
OUTPUT
C
L
= 50pF
DRIVER OUTPUT
R
L
= 3k
INPUT
1300 G12
1300 G13
INPUT
V
L
= 3V
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